{"id":"CVE-2026-16889","revision":"a952021d86dc4b509b9a18da999f2e25","records":[{"revision":"a952021d86dc4b509b9a18da999f2e25","observedAt":"2026-10-29T03:25:09.193+00:00","statement":{"source":"cve-program","id":"CVE-2026-16889","aliases":[],"title":"Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin","description":"In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived from the supplied filename. A user holding the EDIT_SYSTEM_SETTINGS permission can upload an HTML file that is then served as text/html from the openEQUELLA origin, resulting in stored cross-site scripting. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or everyone.","state":0,"publishedAt":"2026-10-29T01:32:09.466+00:00","modifiedAt":"2026-10-29T01:32:09.466+00:00","affected":[{"ecosystem":"Vendor product","name":"openEQUELLA","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Apereo Foundation\",\n                    \"product\": \"openEQUELLA\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2019.1\",\n                            \"lessThan\": \"2026.1\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":4.8,"severity":"MEDIUM"}],"references":["https://github.com/openequella/openEQUELLA/security/advisories/GHSA-q2xv-rffq-mj5w","https://openequella.github.io/guides/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-16889","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-16889","identifiers":["CVE-2026-16889"]},"retained":false,"historicalAffected":[]}],"coverage":[]}